Quick answer
A composite door catching the frame is almost always misalignment from hinge movement, though seasonal expansion and frame packing can also be responsible. It's identified by wear marks on the door edge or frame and resolved with a calibrated hinge adjustment, typically £75–£150, rather than trimming or forcing the door.
Overview
'Catching the frame' means the door is dragging or scraping against the frame when opening, closing or locking. It's almost always a hinge adjustment issue. Left alone, it wears paint off and eventually damages the seal.
Symptoms
- Scrape marks on the door edge or frame.
- Extra effort to open or close.
- Door only catches in one season.
Common causes
- Dropped door.
- Seasonal expansion.
- Frame movement.
Reading the wear marks before touching anything
Before any adjustment, the first thing an installer does is look at where the paint or GRP finish is scuffed on the door edge and the matching mark on the frame or weatherstrip. This tells you precisely where the two surfaces are meeting that shouldn't be, and roughly how much correction is needed — a faint mark might mean 1 to 2mm of overlap, while a deep groove worn through the finish suggests months of contact and a bigger job.
It also tells you whether the catching happens across the full height of the door (suggesting the whole leaf has shifted) or only at one corner (suggesting a single hinge has moved or one corner has dropped). That distinction changes which cam gets adjusted first.
The difference between catching on opening and catching on closing
Homeowners often describe 'catching' generically, but where in the door's travel it happens is diagnostically useful. A door that only catches in the last few centimetres of closing, right as it meets the frame, usually points to compression or horizontal misalignment — the door needs to sit slightly further from the frame. A door that catches partway through its swing, even when it's nowhere near the frame, suggests the hinges themselves are binding or a hinge screw has worked proud.
A door that catches only when you try to lock it, but swings freely otherwise, is a keep alignment issue rather than a hinge issue — the slab is fine, but the hooks and keeps on the frame don't line up.
- Catches in the last inch of closing: horizontal or compression adjustment needed.
- Catches mid-swing at any point: hinge binding or a proud screw.
- Swings fine, but won't lock: keep alignment, not hinge alignment.
Why Cornwall's coastal exposure makes this more common here
Wind-driven rain and salt-laden air both play a role in accelerating the hinge and frame wear that leads to catching. Salt air corrodes exposed steel fixings faster than inland conditions, and on very exposed stretches of coastline — Portreath, the Lizard, north of Padstow — we see hinge screws and keep plates showing surface corrosion within three to four years where an inland property might go a decade without issue.
Wind loading matters too: a door on an exposed elevation is subjected to repeated pressure differentials every time it's opened against a gust, which puts more strain on the hinges than a sheltered doorway sees in normal use. Over time this shows up as exactly the kind of catching described here.
What we check on a catching-frame call-out
A methodical visit covers four things in sequence: the reveal gap measured at four points, the condition and tightness of all hinge screws, the state of the weatherseal (a swollen or displaced seal can mimic a hinge problem), and the alignment of the keeps relative to the multi-point hooks. Only once those are checked do we touch the adjustment cams.
This sequence matters because adjusting hinges to compensate for a swollen seal, for example, will fix the catching temporarily but leave the door genuinely misaligned once the seal is replaced or the weather changes — creating a new problem down the line.
When catching points to something bigger than the door
Occasionally a door that's catching evenly all the way round, with no single point of contact, indicates the frame itself has racked slightly — gone out of square — usually from wall or lintel movement rather than anything wrong with the door. This is more common in older Cornish properties with solid granite or cob walls that move seasonally with moisture content.
In these cases, hinge adjustment can partially compensate, but if the frame is significantly out of square the long-term fix is to reset or pack the frame itself, which is a bigger job than a standard hinge visit.
A worked example from a coastal holiday let
A holiday let in Mevagissey had a composite door that guests kept reporting as 'sticking'. On inspection, the door was catching along its full latch-side edge, worse at the top. The cause was a combination of one worn hinge cam and a weatherseal that had swollen from a summer of high humidity and constant guest turnover propping the door open in the sun. We adjusted the hinge and replaced the seal section, and gave the owner a simple maintenance note to leave with the property manager about not forcing the door if it ever felt tight again.
Frame fixings and how granite and cob openings settle differently
A composite door frame is only as stable as what it's fixed into, and Cornwall's older housing stock throws up two distinct patterns. Granite openings are extremely rigid once a frame is properly fixed, but the stone itself is rarely perfectly square, so frames are often packed with timber or plastic shims behind the fixing points to true up the opening. If those shims compress or the fixing screws back out of soft lime mortar over time, the frame can develop a slight twist that shows up as the door catching evenly along one edge.
Cob and rendered masonry openings move differently — they breathe with seasonal moisture content, expanding slightly in wet Cornish winters and contracting in summer, which can flex a frame fixed directly into the wall by a millimetre or two each way. This is a genuine structural cause of catching that no amount of hinge adjustment permanently fixes, because the frame itself is moving with the building rather than staying still.
How a catching door gets worse if it's left
A door that only lightly brushes the frame on closing rarely stays that way. Each cycle wears a slightly deeper channel into whichever surface is softer — usually the door's GRP skin or the frame's weatherstrip — and as that channel deepens, the door starts dropping into it, which increases the contact pressure and accelerates the wear further. What begins as a faint scuff mark after a few months can become a visible groove within a year of regular use.
Left long enough, the dragging contact starts to distort the door's edge profile enough that the multi-point lock hooks no longer sit square in their keeps, and what was a straightforward hinge adjustment becomes a hook and keep realignment, or in the worst cases a gearbox replacement, because the mechanism has been forced slightly out of true by the constant sideways pressure.
Holiday-let changeover pressure and catching doors
Cornwall's holiday-let sector puts a specific kind of strain on composite doors that owner-occupied homes rarely see: multiple changeovers a week, often with cleaning teams and guests unfamiliar with the door propping it open with furniture or a doorstop for hours at a time while carrying luggage. A door held open in direct summer sun for an extended period expands unevenly, and if it's then forced shut before it's cooled, it can catch hard enough to feel like a hinge fault when it's actually a heat-cycling issue layered on top of an existing minor misalignment.
For managing agents we'd recommend a pre-season check each spring covering hinge tightness, keep alignment, and seal condition, because a door that's fine in April under light use can start catching by August once it's been through twenty-plus changeovers in hot weather.
When adjustment stops being enough
Hinge and keep adjustment has real limits. Once the available cam travel is used up — typically after a hinge has already been wound to one extreme — there's nothing left to correct with, and further catching needs a different fix: packing behind the hinge, replacing the hinge for one with fresh adjustment range, or in frame-movement cases, resetting the frame's fixing points.
As a rule of thumb, if a door has needed the same hinge adjusted twice within twelve months and keeps drifting back to the same fault, that's a sign the underlying cause — worn hinge, degraded frame packing, or genuine structural movement — hasn't been addressed, and it's worth asking for a proper diagnosis rather than a third repeat adjustment.
Typical repair costs in Cornwall
| Work | Typical price | Notes |
|---|---|---|
| Diagnosis and single hinge adjustment | £75–£110 | Typical for a single point of contact |
| Full hinge and keep realignment | £120–£180 | Where catching affects opening and locking |
| Weatherseal section replacement | £40–£90 | Often combined with an adjustment visit |
| Frame packing/reset (out-of-square frame) | £180–£320 | Needed only where the frame itself has moved |
Guide prices only — we confirm the cost after seeing the door.
When to call a professional
- Adjustment doesn't hold.
Prevention
- Annual servicing.
